On 2015-02-18 18:12, Arnd Bergmann wrote: > In the media drivers, the v4l2 core knows about all submodules > and calls into them from a common function. However this cannot > work if the modules that get called are loadable and the > core is built-in. In that case we get > > drivers/built-in.o: In function `set_type': > drivers/media/v4l2-core/tuner-core.c:301: undefined reference to `tea5767_attach' > drivers/media/v4l2-core/tuner-core.c:307: undefined reference to `tea5761_attach' > drivers/media/v4l2-core/tuner-core.c:349: undefined reference to `tda9887_attach' > drivers/media/v4l2-core/tuner-core.c:405: undefined reference to `xc4000_attach' > [...] > Ideally Kconfig would be used to avoid the case of a broken dependency, > or the code restructured in a way to turn around the dependency, but either > way would require much larger changes here. What can be done without extending kbuild is to accept CONFIG_VIDEO_TUNER=y and CONFIG_MEDIA_TUNER_FOO=m, but build both into the kernel, e.g. diff --git a/drivers/media/tuners/Kconfig b/drivers/media/tuners/Kconfig index 42e5a01..d2c7e89 100644 --- a/drivers/media/tuners/Kconfig +++ b/drivers/media/tuners/Kconfig @@ -71,6 +71,11 @@ config MEDIA_TUNER_TEA5767 help Say Y here to include support for the Philips TEA5767 radio tuner. +config MEDIA_TUNER_TEA5767_BUILD + tristate + default VIDEO_TUNER || MEDIA_TUNER_TEA5767 + depends on MEDIA_TUNER_TEA5767!=n + config MEDIA_TUNER_MSI001 tristate "Mirics MSi001" depends on MEDIA_SUPPORT && SPI && VIDEO_V4L2 Actually, I have hard time coming up with a kconfig syntactic sugar to express such dependency. If I understand it correctly, the valid configurations in this case are MEDIA_TUNER_TEA5767 n m y VIDEO_TUNER n x x x m x x x y x x I.e. only VIDEO_TUNER=y and MEDIA_TUNER_TEA5767=m is incorrect, isn't it? Thanks, Michal -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
